Cereals and Pulses Testing: Quality, Composition, Contaminants and Microbiology

Testing or auditing is valuable only when the result is tied to a defined decision. The questions below should be agreed before sampling so that the sample, method, specification and response are aligned.

Moisture migration, insects, mould growth and localized water ingress can create pockets of deterioration within a bulk lot. Mycotoxins can be highly heterogeneous because contaminated kernels are not evenly distributed. A grab sample from a clean-looking bag or truck hatch can therefore understate lot risk. Sampling plans need enough increments and appropriate sample reduction to preserve representativeness.

Processing changes what is measured. Milling separates anatomical fractions; cleaning removes foreign material; cooking changes moisture; fortification adds micronutrients; and blending can dilute or concentrate a contaminant. The testing point should be chosen to answer the decision: incoming commodity, after cleaning, flour stream, finished product or retained reference.

• Define commodity, variety/grade where relevant, crop year, origin and lot size.
• Record storage history, visible moisture damage, fumigation/pest-control events and any blending.
• Treat mycotoxin sampling as a specific statistical problem rather than ordinary compositional sampling.
• Separate raw-commodity tests from finished-food microbiological criteria.
• For fortified products, verify fortificant requirements through applicable product/fortification provisions and current methods.

The 2026 FSSAI cereal manual is the first method reference for covered cereal analyses. Safety questions may additionally require the FSSAI mycotoxin, pesticide-residue, metals and microbiology manuals. Current Indian Standards can provide horizontal microbiological methods such as IS 5402 (Part 1):2021 for colony count where applicable and Salmonella methods under the current IS 5887 series.

A method number is not, by itself, a product specification or legal limit. The method tells the laboratory how a defined measurand is determined; the applicable regulation, product standard, consent, customer specification or validated internal plan supplies the criterion and decision context.

Bulk-grain sampling should cover spatial and temporal variation. When bags are the lot units, select bags across the consignment; when grain is moving through a stream, timed increments can be more representative than a static surface sample. Sample reduction after collection is equally important: careless quartering or scooping can segregate broken grains, fines and contaminated kernels.

The final laboratory portion should remain traceable to the procurement lot. Where a toxin or contaminant result can affect a large commercial decision, retain sufficient sealed material for confirmation and record any sample grinding, splitting or compositing step.

• Use clean, dry equipment that will not add moisture, chemicals or foreign material.
• Collect enough increments to represent the lot and enough final material for all analyses and retention.
• Keep mycotoxin/residue samples traceable to the same defined lot used for procurement disposition.
• Do not dry or clean the sample before submission unless the method/sampling procedure requires it.
• Protect high-moisture or processed samples from microbiological change during transport.

A procurement decision should use both limits and trends. Moisture consistently near an upper specification can predict storage difficulty even before rejection; recurring mycotoxin detections below a maximum limit can justify tighter supplier controls; and a shift in composition can signal change in grade, source or milling practice. Trend charts are often more useful than a folder of isolated certificates.

Different failure types should remain separate in management response. A grade/composition deviation, a mycotoxin exceedance and a pathogen detection can all cause lot rejection, but the root-cause pathway and preventive action are different.

An effective cereal programme connects laboratory data to silo, warehouse and supplier decisions. Risk-based frequencies should account for crop year, monsoon/humidity, origin, storage duration, prior failures and end use. High-risk lots can receive broader safety panels while stable suppliers remain under periodic verification.

Results should be annotated with storage events. A roof leak, extended hold, fumigation, aeration failure or change in source can explain a trend that would otherwise appear random. This operational context turns laboratory history into a usable early-warning system.

• Build seasonal dashboards for moisture, mycotoxins and key composition parameters.
• Link every result to supplier, origin, warehouse/silo and receiving date.
• Use stock rotation together with actual condition monitoring; rotation alone does not correct wet grain.
• Trigger enhanced testing after water ingress, pest infestation, long storage or supplier change.
• Retain representative lot samples when commercial disputes or delayed processing are likely.

Standards, regulations and official methods are revised over time. Before a result is used for a regulatory conformity decision, confirm the current FSSAI notification or Gazette text, the exact food or water category, the latest applicable BIS edition and amendments, the customer or statutory specification, the sampling requirement and the laboratory method/scope. FSSAI compendia are useful ready references, but the original notifications and amendments prevail where there is a conflict. This article is technical guidance, not a substitute for the applicable law, permit or product specification.

• FSSAI Manual(s) of Method(s) of Analysis – Revised Cereal Manual 2nd ed. 2026
• FSSAI Product Standards
• FSSAI Contaminants, Toxins and Residues – amendments
• BIS Indian Standards portal
• Food & Agricultural Products Testing
• Heavy Metals & Pesticide Analysis
• Microbiological Testing
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